The purpose of this study is to evaluate various plant growth regulators (PGRs) and their ability to influence yield and profitability.

2018 Iowa Corn Plant Growth Regulator Study

In 2018 we tested three plant growth regulators at the Iowa PFR site. Two of these were applied in-furrow and one was foliar-applied. The foliar-applied product was the only one that provided a positive return on investment (ROI). Applications of the two in-furrow products was accomplished using a 2x2x2 application system, which may have caused a d ilution of the product at the root zone. Both of the in-furrow products are acid formulations of plant growth hormones, so we would expect them to have mobility within the soil. We speculate that the above average precipitation during the early growth stages, coupled with the dilution of the 2x2x2 application system, may have caused leaching of pr oducts below the root zone before the roots were able to absorb the active ingredient, resulting in little response. In contrast, the foliar-applied product X-CYTO® showed a positive yield response at the V4 growth stage. This application timing was directly before the period of rapid growth and nutrient uptake for corn which likely aided in the enhancement of critical developmental stages and a positive yield increase and ROI.

Pre: 3.5 oz. Corvus®, 1 qt. Atrazine Post: 3 oz. Capreno®, 1 qt. Atrazine | 

8.5 gal. 32-0-0 2x2, 5 gal. PureGrade® Diamond 6-24-6 In-Furrow | 

Foliar X-CYTO®, Fortified Stimulate® Yield Enhancer Plus, Intensify®

2021 Iowa Soybean SINGULATION STUDY 15 IN. ROWS

2021 Iowa Soybean STARTER FERTILIZER STUDY 2X2X2

Plant Growth Regulator Study

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